1. Department of Materials Science and EngineeringShenzhen Key Laboratory of Full Spectral Solar Electricity Generation (FSSEG)Southern University of Science and Technology No. 1088, Xueyuan Rd. Shenzhen 518055 Guangdong China
2. Department of PhysicsThe University of Hong Kong Pokfulam Hong Kong SAR China
3. Department of PhysicsSouthern University of Science and Technology of China Shenzhen 518055 Guangdong China